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Fix HKDF on big-endian #5478

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Merged
merged 1 commit into from
Aug 26, 2025
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Fix HKDF on big-endian #5478

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3 changes: 2 additions & 1 deletion crypto/s2n_hkdf.c
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Original file line number Diff line number Diff line change
Expand Up @@ -82,7 +82,8 @@ static int s2n_custom_hkdf_expand(struct s2n_hmac_state *hmac, s2n_hmac_algorith
POSIX_GUARD(s2n_hmac_update(hmac, prev, hash_len));
}
POSIX_GUARD(s2n_hmac_update(hmac, info->data, info->size));
POSIX_GUARD(s2n_hmac_update(hmac, &curr_round, 1));
uint8_t curr_round_byte = curr_round;
POSIX_GUARD(s2n_hmac_update(hmac, &curr_round_byte, 1));
POSIX_GUARD(s2n_hmac_digest(hmac, prev, hash_len));

cat_len = hash_len;
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